Black or brown gunk from under the blade cog?

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TC M.
Joined: 2/15/2013

While cleaning my Nutribullet the other day, i noticed a build-up of dark gunk on the bottom of the extractor blade cap, around the cog that fits down inside the base.  It looked like it had been burned at first, but with a little scratching the black stuff came off.  I didn't think much about it at the time, but tonight after making a smoothy the gunk was back, only fresh and kinda chocolate brown.  Didn't have anything to do with the smoothy material, which was a completely different color.  Has anyone else exerienced this?  I figure it's some sort of grease or lubricant coming out from under the rubbery cog there, but if that's the case, does that bode ill for continued use of the extractor blade?  I've only had this thing for about six months...

I have noticed this too. Do we scrub it off somehow?
I returned mine dor that same reason. ..it took a lol while. ..but it was worth it. ...u need to us e less liquid. ..u r probably filling the cup too much ...fyi the return was free if still wie in the time of your warranty
I returned mine dor that same reason. ..it took a lol while. ..but it was worth it. ...u need to us e less liquid. ..u r probably filling the cup too much ...fyi the return was free if still wie in the time of your warranty
vanidessa, I don't think it's from too much liquid...I always keep the levels below the max line, and it's not leaking out from around the rubber seal, which is where you'd expect it to. Just from under the bottom cog, around the shaft that spins the blade. It's also a completely different color than the materials I have in the cup...smoothies are usually green or orange/yellow, whereas this is an unappetizing brown. Here's a sample picture... http://www.flickr.com/photos/tcmartindale/8860557905/ When I used it at lunch today, it was even worse, dripping and such. Bleh. Thankfully I have the accessories pack with spare cup and blade, 'cause I think this one's toast.
Same here. The brown gunk!
I'll pass along the response I got from Nutribullet Customer Service... "Please be advised that all Nutribullet blade assemblies are made of stainless steel and should not release any liquid. However, based on the information provided in your email, it appears that the liquid released is a non-toxic food grade lubricant. The problem generally occurs when there is an improper connection with the blade and motor base. For future reference, please follow the tips below to extend the life of your product. 1. Keep all contents below the max line. 2. Keep run time under one minute intervals. 3. Attach the blade assembly tightly to the container. 4. Let the motor come to a complete stop (2 seconds) before lifting the blade and cup attachment from the power base. 5. Wash all parts by hand and allow to air dry – do not place parts in the dishwasher."
I have the same Problem.
I saw a Youtube video and it appears that the blade holder has been redesigned on the latest model to reinforce the area where it is attached.
Here is a link to that video. http://www.youtube.com/watch?v=VJ_LA2XfOeU
I have the same brown gunk on the bottom of mine as well. Does anyone know if maybe we can soak the base in white vinegar to clean it? Just a thought...?
Why not just replace the blade with one that doesn't leak?
I noticed it quite a while back and first thought my wife had spilled some cinnamon or cacao powder in it. I noticed a small amount of it after just about every use and thought it might be some of the material that is used for the clutch. It finally went for good this morning and leaked a small amount into the base. Hopefully I can get it replaced under warranty.
I purchased a new blade & it was only $9.95 ....it is more sturdy & works great...I love my NB & that was a small price to pay for my health!
sdownour wrote: I purchased a new blade & it was only $9.95 ....it is more sturdy & works great...I love my NB & that was a small price to pay for my health!
Exactly.
I have had this problem too and noticed there was a leak because of a loose fit on the back of the cap opposite of where the blade is. Obviously if this is loose then the contents can leak through. My concern it can leak into the motor and ruin the unit. I have contacted customer service today and will wait for reply. Hoping for a replacement part since it is under warranty.
judymc wrote: I have had this problem too and noticed there was a leak because of a loose fit on the back of the cap opposite of where the blade is. Obviously if this is loose then the contents can leak through. My concern it can leak into the motor and ruin the unit. I have contacted customer service today and will wait for reply. Hoping for a replacement part since it is under warranty.
Don't use it until you get the blade replaced, or you will ruin the motor.
Excellent customer service. My email was answered and I was told they would send a replacement part, that I would need to pay shipping , to please call the toll free number. No need to wait on hold, they call you back based on call order. All this on a Saturday too! Very pleased.
I had the same problems with the brown dust i called it and the leaking then my unit was not working well. I contacted customer service and they sent me a replacement and new blades! love Nutri bullet.
I have also had this happen but being quite mechanically minded I took it apart to find the problem, it seems the small bearing in the cap has a food based grease in it and it will leek if you over load or over heat the blades ( to much frozen fruit or left on to long)so I just swapped the milling blade with the other one and now just take it a little easier when blasting. The replacements are cheap enough so probably a good idea to get a spare. I can't see that it's possible for the grease to get into the blast as this would require the grease to flow uphill.. Love the Blaster...
good@iprimus.com.au wrote: I have also had this happen but being quite mechanically minded I took it apart to find the problem, it seems the small bearing in the cap has a food based grease in it and it will leek if you over load or over heat the blades ( to much frozen fruit or left on to long)so I just swapped the milling blade with the other one and now just take it a little easier when blasting. The replacements are cheap enough so probably a good idea to get a spare. I can't see that it's possible for the grease to get into the blast as this would require the grease to flow uphill.. Love the Blaster...
The blade has also been redesigned, which reduces this problem.
I have one of the old blades and mine is starting to leak the brown gunk...how can I be sure I'm getting the newer model if I buy a new one? I have watched the YouTube video someone posted (which was awesome) and you can clearly see that the new version is so much better. When did the company stop making the old ones? Or did they...Mine was given to me by a friend so I'm not sure how old it is. I can always ask at the store to open the box - I was just curious if there was an easy way to know the old models from th new ones since the box looks the same.
bethybright wrote: I have one of the old blades and mine is starting to leak the brown gunk...how can I be sure I'm getting the newer model if I buy a new one? I have watched the YouTube video someone posted (which was awesome) and you can clearly see that the new version is so much better. When did the company stop making the old ones? Or did they...Mine was given to me by a friend so I'm not sure how old it is. I can always ask at the store to open the box - I was just curious if there was an easy way to know the old models from th new ones since the box looks the same.
Well now there are two new blades. The newest one has a non-removable gasket so food doesn't collect under it and start to smell. The one before that, has a removable gasket, which you have to remove and clean every few blasts. Which one do you get, hopefully the new non-removable one.
My extractor blade is leaking black oil. I just ordered a new extractor blade, hopefully this one won't leak.
leanbysummer wrote: My extractor blade is leaking black oil. I just ordered a new extractor blade, hopefully this one won't leak.
My advice, order a spare, that way, when it leaks again, you can just swap it out while waiting for the new one to arrive. They are only $10.
Good idea. I should have ordered two.
tcmartindale wrote: While cleaning my Nutribullet the other day, i noticed a build-up of dark gunk on the bottom of the extractor blade cap, around the cog that fits down inside the base.  It looked like it had been burned at first, but with a little scratching the black stuff came off.  I didn't think much about it at the time, but tonight after making a smoothy the gunk was back, only fresh and kinda chocolate brown.  Didn't have anything to do with the smoothy material, which was a completely different color.  Has anyone else exerienced this?  I figure it's some sort of grease or lubricant coming out from under the rubbery cog there, but if that's the case, does that bode ill for continued use of the extractor blade?  I've only had this thing for about six months...
The brown gook is actually RUST build up in the extractor piece and no amount of cleaning helps. The blade must be replaced about every 6 months.
I have noticed this with mine lately. I can taste the lubricant. Be careful.
It could just be that you're over-filling the blender causing it to leak. See if you're filling past the "Max" line on the plastic container. If not, then I would contact someone from NutriBullet and talk to them, maybe you could get a replacement, especially if it has a warranty on it.
My Kitchen Aid Mixer seems to be leaking grease, (appears to be heavier than oil) and is getting worse. I have used it for a while like that, cleaning up the mess but it is all inside the mixer now when I tip the mixer up and on the counter. I am worried that the grease is supposed to lubricate the motor plus it is messy. I have ordered another mixer. Hope I have better luck with the next one. I originally had a Hobart (Company bought out by Kitchen Aid) mixer for years. It was heavy duty. I replaced it with a newer model. Most likely, that mixer is still performing like a champ. Newer is not always better.
I just had that problem with my blender. Your cog is wearing out and needs replaced. It’s depositing rubber on the bottom of your blade assembly. Order the coupling (cog) and take the old one off br turning it counterclockwise. Replace with new cog. Scrape off as best you can the residue on your blade assembly and it’s ready to go. If you blend frozen fruit, let it thaw a bit first before using. That’s what caused your cog to wear down in the first place.
I had the same problem. The dark liquid is combination of rust and earring out material from the bearing assembly. It is a very bad bearing design. When it is sitting with blade face down, it collects liquid from washing and it sits there and rusts the beating parts and the blade shaft.
The above is correct I’ve had to replace a number of heads. The bearing is not sealed well enough which allows fluid ingress and subsequently rusts the steel bearing. This design flaw needs to be addressed